Question

There is a magnetic field acting in a plane perpendicular to the sheet of paper downward into the paper as shown in figure, a particle in vacuum moves in the plane of paper from left to right as shown in figure. The path inclined by the arrow could be travelled by

• A. Proton
• B. Neutron
• C. Electron
• D. Alpha particle

Answer 1

The correct option is C Electron

$\overrightarrow{F}=q\left(\overrightarrow{v}\times \overrightarrow{B}\right)=qvB\left(\hat{i}\times \left(-\hat{k}\right)\right)=qvB\hat{j}$

As seen from the diagram, the particle experiences force in $-\hat{j}$ direction.

Charge of the particle $q$ is negative.

Hence ,Option $C$ is correct.